EP 1528621 A1 20050504 - Loop coil antenna
Title (en)
Loop coil antenna
Title (de)
Schleifenantenne
Title (fr)
Antenne à boucle
Publication
Application
Priority
JP 2003368192 A 20031029
Abstract (en)
This invention constructs an antenna matching circuit (16) able to avoid a bad influence when a conductor such as a metal, a tag, etc. approaches a reader/writer (11), and dissolves a communication defect area on the reader/writer side and stably maintains a communication distance.In this invention, in a RFID system in which, when the tag corresponds to the generating area of a magnetic field generated in an antenna coil of the reader/writer (11), a radio wave for sending information to the reader/writer is outputted by operating a control circuit of the tag by electric power generated in an antenna coil of this corresponding tag, a conductor (17) is arranged near the antenna coil (15) of the reader/writer and an eddy current is intentionally flowed. Thus, the communication defect between the reader/writer and the tag approaching this reader/writer is reduced.
IPC 1-7
IPC 8 full level
G06K 17/00 (2006.01); G06K 7/08 (2006.01); G06K 19/077 (2006.01); H01Q 1/22 (2006.01); H01Q 1/24 (2006.01); H01Q 7/00 (2006.01); H04B 1/59 (2006.01); H04B 5/48 (2024.01)
CPC (source: EP US)
G06K 7/10316 (2013.01 - EP US); G06K 7/10336 (2013.01 - EP US); H01Q 1/2216 (2013.01 - EP US); H01Q 7/00 (2013.01 - EP US)
Citation (search report)
- [X] US 6307517 B1 20011023 - LEE DONNY V [US]
- [X] US 6567050 B1 20030520 - BRIGGS JAMES B [US]
Designated contracting state (EPC)
DE FR GB GR IT
DOCDB simple family (publication)
EP 1528621 A1 20050504; CN 1619572 A 20050525; JP 2005136528 A 20050526; JP 2005136944 A 20050526; JP 3570430 B1 20040929; JP 4131250 B2 20080813; US 2005092836 A1 20050505
DOCDB simple family (application)
EP 04256650 A 20041028; CN 200410090146 A 20041029; JP 2003368192 A 20031029; JP 2004137176 A 20040506; US 97539504 A 20041029